COTYLEDON Meaning of COTYLEDON in English cotyledon BrE AmE ˌkɒt ɪ ˈliːd ə n -ə-; - ə l ˈiːd- AmE \ ˌkɑːt ə l ˈiːd ə n▷ cotyledon|ous əs▷ cotyledon|s z Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012